Use our GPM to PSI Calculator to convert flow rate (GPM) into pressure (PSI) and calculate required pump power. Includes formulas, examples, and step-by-step explanations.
The GPM to PSI Calculator is a useful tool for determining the pressure (PSI) produced by a specific flow rate (GPM) and pump head. It is commonly used in fluid mechanics, pump selection, and hydraulic system design.
This calculator helps engineers, plumbers, and technicians quickly determine the required pressure and horsepower for a pump based on flow rate, head, and pump efficiency.
What is GPM and PSI?
- GPM (Gallons per Minute) – A measure of flow rate, indicating how many gallons of liquid flow through a system per minute.
- PSI (Pounds per Square Inch) – A unit of pressure that measures the force applied over a certain area.
In fluid systems, GPM and PSI are directly related to pump performance. If the pump head (height the pump needs to lift fluid) is known, PSI can be calculated from GPM.
Formula to Convert GPM to PSI
To convert GPM to PSI, we use the concept of pump head:
PSI=2.31Head (ft)×SG
Where:
- Head (ft) = Vertical height or head (in feet) that the pump needs to lift the fluid.
- SG = Specific Gravity of the fluid (for water, SG = 1).
- 2.31 = Conversion factor (1 PSI = 2.31 ft of head for water).
Pump Horsepower Calculation
Along with pressure, you can also determine the pump horsepower (HP) needed for a specific GPM and PSI using:
HP=1714×EfficiencyGPM×PSI
Where:
- GPM = Flow rate (gallons per minute).
- PSI = Pressure in pounds per square inch.
- Efficiency = Pump efficiency (in decimal or percentage form).
- 1714 = Conversion constant for hydraulic horsepower.
Step-by-Step Example
Let’s calculate PSI and HP for a pump with the following values:
- Flow Rate (GPM): 50
- Head (ft): 100
- Specific Gravity (SG): 1 (water)
- Pump Efficiency: 85%
Step 1: Calculate PSI
PSI=2.31100×1=43.29PSI
Step 2: Calculate Horsepower
HP=1714×0.8550×43.29=1.48HP
Why Use This GPM to PSI Calculator?
- Quickly convert flow rate to pressure without complex manual calculations.
- Get pump power (HP) alongside PSI for better system design.
- Perfect for engineers, pump technicians, and students.
Conclusion
The GPM to PSI Calculator is a powerful tool for fluid system design. By knowing just the flow rate, head, and pump efficiency, you can quickly determine PSI and the required pump power. Use this tool to save time and improve accuracy in pump selection.
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